From mboxrd@z Thu Jan 1 00:00:00 1970 From: Manfred Spraul Subject: Re: [2/3] via-rhine: de-isolate PHY Date: Sun, 08 Aug 2004 23:04:06 +0200 Sender: linux-kernel-owner@vger.kernel.org Message-ID: <41169546.5000308@colorfullife.com> References: <411684D5.8020302@colorfullife.com> <20040808200532.GA19170@k3.hellgate.ch> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, Netdev Return-path: To: Roger Luethi In-Reply-To: <20040808200532.GA19170@k3.hellgate.ch> List-Id: netdev.vger.kernel.org Roger Luethi wrote: > > >>I know that PHYs go into isolate mode if the startup id is wired to 0, >> >> > >Wouldn't that be s/go/can go/ ? > > > I don't have the MII standard, my knowledge is from the DP83840A specs: The pin description contains a section about the phy ids: During power up five pins are latched to determine the initial phy address. Then the following sentence in bold: "An address selection of all zeros (00000) will result in a PHY isolation condition". I've reread the DP specs and I now think that your current patch is sufficient: The isolate state is independant from the phy address - a non-zero phy can be in isolate mode and the phy zero can be non-isolated. The phy id just sets the power-up value of the isolate bit: 0 means start isolated, non-zero means start non-isolated. If this is really true then handling phy 0 is trivial: First scan 1-31. If nothing found: try 0. If a phy is found: clear the isolate bit and then use phy 0. -- Manfred